Lippincott, SarahLee (1978). “Astrometric search for unseen stellar and sub-stellar companions to nearby stars and the possibility of their detection”. Space Science Reviews22 (2). Bibcode: 1978SSRv...22..153L. doi:10.1007/BF00212072. ISSN0038-6308.
Lippincott, SarahLee (1978). “Astrometric search for unseen stellar and sub-stellar companions to nearby stars and the possibility of their detection”. Space Science Reviews22 (2). Bibcode: 1978SSRv...22..153L. doi:10.1007/BF00212072. ISSN0038-6308.
Matthews, R. A. J. (1994). “The close approach of stars in the solar neighbourhood”. Quarterly Journal of the Royal Astronomical Society35: 1-9. Bibcode: 1994QJRAS..35....1M. ISSN0035-8738.
Lippincott, SarahLee (1978). “Astrometric search for unseen stellar and sub-stellar companions to nearby stars and the possibility of their detection”. Space Science Reviews22 (2). Bibcode: 1978SSRv...22..153L. doi:10.1007/BF00212072. ISSN0038-6308.
Matthews, R. A. J. (1994). “The close approach of stars in the solar neighbourhood”. Quarterly Journal of the Royal Astronomical Society35: 1-9. Bibcode: 1994QJRAS..35....1M. ISSN0035-8738.